Syringe.



No. 664,840. Patanted Jan. I, I90].

8. J. DOUDS.

SYRINGE.

(Application filed Apr. 26, 19QO.)

(No Model.)

lineman Aren't OFFICE.

BYRON J. nouns, or CANTON, orno.

SYRiNGE.

SPECIFICATION forming part of Letters Patent No. 664,840, dated January 1,, 1901.

Application filed April 26, 1900. Serial No. 14,517. (No model.)

To all whom it may concern:

Be it known that I, BYRON J. DOUDS, acitizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a new and useful Syringe, of which the following is a specification.

My invention relates to improvements in syringes; and the object of my improvement is to provide a continuously-lubricated barrel and piston adapted to be used as a syringe. I attain this object by the mechanism illustrated in the accompanying drawings, in which- Figure l is a view of the entire syringe with the barrel cut away to show the piston in position. Fig. 2 is a view of the piston detached. Fig. 3 is a longitudinal section of the piston on the line a; so, Rig-2; and Fig. 4 is a view of the piston-head with washer removed.

A is the syringe-barrel, which is provided at one end with a nozzle ct, adapted to permit the passage of liquid, and at the opposite end with the usual cap or stop a, through which the piston-rod extends.

Bis the piston, which is of tubular construction, the hollow interior being closed at the inner end of the piston by an end piece formed thereon, as shown in Fig. 3. This hollow interior is also closed at the outer end of the piston in the manner hereinafter described. By closing this hollow interior at both the inner and outer ends of the piston a closed chamber b is formed for containing a supply of oil. The piston-head is provided with an annular groove 1) for the reception of a porous washer 12 preferably made of leather. ioles b through the lateral wall of the piston-head enable the oil to reach the washer 12 which it permeates and keeps moist and pliable constantly and through which it percolates to its outer surface and assures the continuous lubrication of the barrel and pis ton. By removing the piston from the barrel and the washer from the annular groove the piston-chamber can be filled through the holes 5 by immersing the piston in the liquid.

lhe piston B is provided at its outer end with a knob 19 or its equivalent, which serves the usual purpose in operating. Access to the chamber 1) is secured at this outer end in order that said chamber may be filled without removing the piston from the barrel, its return being frequently accompanied with considerable inconvenience. This is accomplished by providing a threaded recess in the inner end of knob b adapted to receive the threaded end of the piston-rod, as shown in Fig. 3, whereby the chamber b can be conveniently opened and closed.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. As an article of manufacture a syringe consisting of a barrel having a nozzle at one of its ends, a cap located at the opposite end, a hollow piston with the interior closed at its inner and outer ends, an annular groove located around the piston-head, holes extending from the annular groove to the pistonchamber and a porous Washer located in the annular groove, substantially as described and for the purpose specified.

2. As an article of manufacture a syringe consisting of a barrel having a nozzle at one of its ends, a cap located at the opposite end, a hollow piston with the interior closed at its inner and outer ends, a removable knob, located at the outer end of the piston to open and close the piston-chamber, an annular groove located around the piston-head, holes extending from the annular groove to the piston-chamber and a porous washer located in the groove, substantially as described and for the purpose specified.

BYRON J. DOUDS.

WVitnesses: v

J. CLARK OLDFIELD, J. A. J nrrnas. 

